Abstract: Systems, apparatus and methods for recording or reproducing from a re-recordable record carrier digital signals, representing a digital audio signal, containing information which results in concealment of a portion of a replica of the digital audio signal during its reproduction to prohibit audio distortions resulting from a boundary between two digital signals, wherein one of those digital signal is newly-recorded over a previously-recorded other digital signal. The concealment information can also be included in auxiliary signals recorded on reproduced from the record carrier along with the digital signals. In a recording apparatus, a digital signal including audio information (i.e.

Abstract: A digital transmission system comprising a transmitter (3, 5, 7, 8) and a receiver (14, 15, 16, 18). The medium (6) comprises an information channel (T.sub.1, T.sub.2, . . . , T.sub.n) and an auxiliary channel (T.sub.n+1). Through the information channel information is transmitted, for example a digital audio signal. Through the auxiliary channel an auxiliary signal is transmitted. This auxiliary signal comprises sync information (100, 101, 102, 103, 104, 105) and additional information (106).The auxiliary signal is composed of successive blocks ( . . . , B.sub.n-1, B.sub.n, B.sub.n+1, . . . ). A first block (B.sub.n) comprises a first block section (header) and a second block section (body). The first block section of the block (B.sub.n) contains a sync word (101) and a first codeword (102), in this order. The first block section of the second directly successive block (B.sub.n+1) contains a sync word (104) and a second codeword (105), in this order.

Abstract: Method and apparatus for writing and/or reading an address code on a record carrier, preferably for audio signals, which code consists of a number of preamble pulses, a number of code pulses and a number of post-amble pulses equal to the number of preamble pulses, while between the code pulses check pulses may be inserted.